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The Luxfer Group Employee Share Ownership Plan (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Payment Arrangements [Abstract]  
Disclosure of movement in the number of ESOP share options
The movement in the number of shares held by the Trustees of the ESOP and the number of share options held over those shares are shown below:
 
 
Number of shares held by ESOP Trustees
 
 
 
£0.0001 deferred shares
 
£0.50 ordinary shares
 
 
At January 1, 2017
15,977,968,688

 
55,816

 
 
Shares utilized during the year
—

 
(34,594
)
 
 
Shares transferred into ESOP during the year
—

 
83,487

 
 
At December 31, 2017
15,977,968,688

 
104,709

 
The following table illustrates the number of, and movements in, share options during the year, with each option relating to 1 ordinary share:
 
 
2017
 
2017
 
2016
 
2016
 
 
 
Number
 
Weighted average exercise price
 
Number
 
Weighted average exercise price
 
 
At January 1
963,789

 
$8.51
 
1,144,534

 
$7.26
 
 
Granted during the year
386,614

 
$0.65
 
107,660

 
$0.67
 
 
Exercised during the year
(172,501
)
 
$(5.03)
 
(132,599
)
 
$(0.67)
 
 
Accrued dividend awards
12,258

 
$0.65
 
12,572

 
$0.67
 
 
Lapsed during the year
(7,845
)
 
$(0.65)
 
(168,378
)
 
$(0.67)
 
 
At December 31
1,182,315

 
$6.42
 
963,789

 
$8.51